package org.bouncycastle.asn1;

import java.io.IOException;

/**
 * We insert one of these when we find a tag we don't recognise.
 */
public class DERUnknownTag extends DERObject {
    int tag;
    byte[] data;

    /**
     * @param tag
     *            the tag value.
     * @param data
     *            the octets making up the time.
     */
    public DERUnknownTag(int tag, byte[] data) {
        this.tag = tag;
        this.data = data;
    }

    public int getTag() {
        return tag;
    }

    public byte[] getData() {
        return data;
    }

    void encode(DEROutputStream out) throws IOException {
        out.writeEncoded(tag, data);
    }

    public boolean equals(Object o) {
        if (!(o instanceof DERUnknownTag)) {
            return false;
        }

        DERUnknownTag other = (DERUnknownTag) o;

        if (tag != other.tag) {
            return false;
        }

        if (data.length != other.data.length) {
            return false;
        }

        for (int i = 0; i < data.length; i++) {
            if (data[i] != other.data[i]) {
                return false;
            }
        }

        return true;
    }

    public int hashCode() {
        byte[] b = this.getData();
        int value = 0;

        for (int i = 0; i != b.length; i++) {
            value ^= (b[i] & 0xff) << (i % 4);
        }

        return value ^ this.getTag();
    }
}
